RB760 is it damaged?

hi,

I’m trying to netinstall RB760. It does not show up in netinstall.
But when powering it with reset button pressed, I never got SFP LED solid or flashing . Nothing. It’s always off. Only got power LED, and eth1 blinking green. Both POE and DC power is the same.
Is it damaged beyond recovery? Or there is anything else I could try.

Manual says:
Release the button when green SFP LED starts flashing, to reset RouterOS configuration to defaults.
Release the button when the SFP LED turns solid green to clear all configuration and bridge all interfaces.
Release the button after SFP LED is no longer lit (~20 seconds) to cause a device to look for Netinstall servers (required for reinstalling RouterOS over the network).

thx